/* piglatin1.cpp -- Pig Latin Converter

   Rules for Pig Latin - Each word is converted individually
   according to the following rules:

   1. If the word has no vowels (other than 'y', e.g. "my", "thy") append "yay" 
      to it -- i.e., "myyay", "thyyay".
   2. If the word begins with a vowel (e.g., "art", "else") append "yay" to the 
      word (i.e., "artyay", "elseyay").
   3. If the word begins with a consonant (e.g., "song", "pig") divide the word 
      at the first vowel, swapping the front and back halves and append "ay" to 
      the word (i.e., "ongsay", "igpay") 
 */

#include <iostream>
#include <string>
using namespace std;

/* Returns the length of the longest head of a that
   has no characters in the string b. [Similar to strcspn
*/
int findFirst(const string& a, const string& b)
{
  int first, where;
  first = where = a.length();
  for (int k = 0; k < b.length(); ++k)
    {
      where = a.find(b[k]);
      if ((where != string::npos) && (first > where))
	first = where;
    }
  return first;
}

// It returns the pig latin translation for the "given" word.
string platin(const string& given)
{
	// strcspn is a standard C function, see manual pages
	//	int firstVowel = strcspn(given.c_str(), "aeiouAEIOU");
	int firstVowel = findFirst(given, "aeiouAEIOU");
	if ((firstVowel == 0)                 // starts with vowel
		|| (firstVowel >= given.length()))// there are no vowels
		return given + "yay";
	return given.substr(firstVowel, given.length() - firstVowel) 
		+ given.substr(0, firstVowel)
		+ "ay";
}

// Given a string s, it returns the string with all letters capitalized
string capitalize(const string& s)
{
	string code;
	for (int k = 0; k < s.length(); ++k)
		code += toupper(s[k]);
	return code;
}

void main (void)
{
	string word;

	cout << "Enter a word to be converted: ";
	cin >> word;
	cout << "The Pig Latin for \"" << word << "\" is \"" 
		 << capitalize(platin(word)) << "\" " << endl;
}